用它的所有回滚段重新创建回滚表空间。

Recreate the rollback tablespace with all of its rollback segments.

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retention能做好地工作如果——当前的回滚表空间对活动事务有足够的空间。

RETENTION parameter works best if the current undo tablespace has enough space for the active transactions.

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对于联机备份，需要特别注意SYSTE m表空间和回滚段表空间。

For online backup, special care needs to be taken for the SYSTEM table space and rollback segments table space.

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